I am the 'someone' that is trying to crack it.
I can give some info about what I have discovered.
Yes, it is the same type of API as Boomerang (Dramafever).
DC's API doesn't work outside the US, unlike Boomerang's.
My Boomerang trick doesn't work with DC Universe.
The encryption used is Widevine, Playready and Fairplay.
The URL that DC downloads for offline viewing is Widevine.
Subtitles are not encrypted and can be downloaded.

Use this script:
https://gist.github.com/xor10/8f65c1e66a34386e1131f8c28ff6bf64/raw/flix.min.user.js
You need:
Chrome
Tampermonkey
After Tampermonkey is installed, open the link. It should ask you if you want to install it. Install it.
Now go onto the Netflix and go play the video you want.
Then do CTRL + ALT + SHIFT + N
It should bring up a box with audio and subtitle download options.